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T. R. NEWMAN.

POWDER THAWER.

No. 595,195. Patented Deo. 7, 1897.

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THEODORE R. NEVMAN, OF RUSSLAND, CANADA.

POWDER-THAWER.

SPECIFICATION forming part of Letters Patent No. 595,195, dated December 7, 1897.

Application tiled April 27, 1897. Serial No. 634,131. (No modeh) To rtZZ w21/,077e it m/rtj/ con/cern,.-

Be it known that l, THEODORE R. NEWMAN, a citizen of the United States, residing at Rossland, in the county of Vest Kootenay and Province of British Columbia, Canada, have invented a new and useful Powder-Thawer, of which the following is a speciiication.

This invention relates to means for heating or warming giant, Hercules, or other form of powder and explosives containing nitroglycerin and used for blasting and mining purposes and which requires thawing in order to soften and bring it in condition for performing the work in an effective manner.

For a full understanding of the merits and advantages of the invention, reference is to be had to the accompanying drawings and the following description.

The improvement is susceptible of various chan ges in the forni, proportion,an d the minor details of construction without departingfrom the principle or sacrificing any of the advantages thereof, and to a full disclosure of the invention an adaptation thereof is shown in the accompanying drawings, in which- Figure 1 is a perspective view of a heater embodying the improvements. Fig. 2 is a vertical central section thereof. Fig. 3 is a detal view in perspective of the stand or rest for the receptacle containing the powder or explosive t0 be warmed or thawed.

Corresponding and like parts are referred to in the following description and indicated in the several views of the drawings by the same referenee-characters- The heater 1 is of a frusto-conical form and has an opening in one side closed by a door 2, having a damper 3, and is provided at the opposite side with a smoke-pipe f1, rising to a safe distance above the boiler 5, which is of cylindrical form and mounted upon the heater, to which it is secured in any convenient way. By having the heater of frustoconical form an extended base is provided of greater extent than the cross-sectional area of the boiler, thereby insuring stability when the device is in operation.

The boiler 5 is provided at its sides with handles 6 and has a spout 7 near its upper end, through which water may be supplied thereto without requiring the removal of the powder-receptacle 8. An inner flange 0 is provided at the upper end of the boiler and receives the receptacle S, the latter having an outward flange l0 atits upper end, which rests upon and overlaps the flange 9, thereby securing a close joint between the upper portions of the boiler and powder-receptacle. A centrally-disposed tube or pipe 11 passes through the powder-receptacle and communicates with the bottom thereof and projects above the top of the said receptacle and terminates in a flaring portion 12, which limits the upward movement of the cover 13, slidably mounted upon the upper portion of the tube and having a flange overlapping the flange l() and cngaged at opposite points by turn-buttons or fastenings 14, by means of which the cover is securely held in place when the heater is in service.

A rest or stand 15 is interposed between the top side of the heater and the bottom side of the powder-receptacle and is of skeleton form,

being composed of an upper ring 1G, a lower ring 17, and intermediate uprights 18. This stand or rest does not interfere with the circulation of the water contained in the boiler 5 nor prevent the heating of the powder contained in the receptacle 8, for which it provides a support.

Fuel of any nature may be burned in the heater 1, and water is placed in the boiler 5, and the receptacle 8, being supplied with the powder or explosive to be thawed or warmed, is immersed in the water contained in the boiler 5 and is closed by the cover 13, secured by the fastenings 14. It will thus be seen that the explosive cannot be overheated and cannot possibly come in direct contact with the iire, thereby precluding all danger from this source. i

Having thus described the invention, what is claimed as new is 1. In a heater for explosives, the combination of a boiler, a receptacle for the explosive removably fitted within the boiler and forming a close joint therewith at its upper end,

a tube extending through the receptacle and.

having its upper end flared, and a cover slidably mounted upon the projecting portion of the tube, substantially as speciiied.

2. In a heater for explosives, the combination of a boiler having` an inner flange at its upper end, a receptacle for the explosive re- IOO movably fitted Within the boiler leaving a Space between its bottom and sides and the corresponding parts of the boiler, and having an outer flange at its upper end to overlap the inner flange of the boiler, a tube extending centrally through the receptacle and opening through the bottom thereof, a @over slidably mounted 4upon the upper portion of the tube for closing the receptacle, and fastenings applied to the inner {iange of the boiler and adapted to extend over the rim of the cover and hold it and the receptacle in position, substantially as set forth.

3. The herein-described device for thawing or heating explosives, consisting of a heater of frusto-eonieal form provided with a smokepipe and a door having a damper-controlled opening, a boiler mounted upon the heater, a receptacle removably 'litted Within the THEODORE R. NEVMAN.

XVitnesses:

ALBERT E. FRrrsoHv, EDWIN CAMPBELL. 

